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      The unconsolidated sediments are deposits which were formed by secondary sedimentation of previously weathered rocks and redeposition of their fragments, and/or by chemical and biochemical precipitation from solutions. They were not compacted and lithified. Unconsolidated sediments are mostly of Tertiary and Quaternary ages. However, there are some exceptions, as the Cambrian blue clays of St. Petersboug with their important fossils (gastropods, hyolithids, spores).

písek - sklářský

No. of sample:	g5159
Rock:	písek, sedimenty nezpevněné
Description:	jedna krabička
Localization:	Střeleč u Jičína
Author:	leg. Petránek,1964
Comment:	křída - jakost T22 - 0,22 Fe2O3

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